Neutron capture in 122,123,124Te: Critical test for s process studies

Details Neutron capture in 122,123,124Te: Critical test for s process studies Neutron capture in 122,123,124Te: Critical test for s process studies

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvc..45.2470w&link_type=abstract

Physical Review C (Nuclear Physics), Volume 45, Issue 5, May 1992, pp.2470-2486

Physics

Nuclear Physics

29

Radiative Capture, 90<=A<=149, Origin, Formation, And Abundances Of The Elements

Scientific paper

The neutron capture cross sections of 122,123,124,125,126Te were measured in the energy range from 10 to 200 keV at the Karlsruhe Van de Graaff accelerator using gold as a standard. Neutrons were produced via the 7Li(p,n)7Be reaction by bombarding metallic Li targets with a pulsed proton beam. Capture events were registered with the Karlsruhe 4π barium fluoride detector. Several sets of measurements were performed under different experimental conditions to study the systematic uncertainties in detail. The cross section ratios σ(Te)/σ(Au) were determined with an overall uncertainty of ~1%. This is an improvement by about a factor of 5 compared to existing data. Maxwellian-averaged neutron capture cross sections were calculated for thermal energies between kT=10 and 100 keV by normalizing the cross section shape up to 600 keV neutron energy reported in literature to the present data. These stellar cross sections were used in an s process analysis. With the classical approach the abundances of the three s only isotopes 122,123,124Te could be reproduced within the experimental uncertainties of ~1%. The accuracy of the present data also allowed us to derive constraints for the existing stellar models with respect to the effective neutron density. Furthermore, the p process abundances for the tellurium isotopes are discussed.

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